curvature and differentials

[Stefan]

Hi,

I'm noticing that OSL does not seem to use the surface curvature when calculating the differentials of reflected or refracted rays. This is especially obvious when rendering a magnifying glass over a finely detailed image texture with mip maps, the texture lookups in refracted rays have much larger ds and dt than they should. Are there any plans of extending the BRDFs to take dNdx and dNdy into account?

-Stefan